Update README.rdoc

Added information about installing capybara-webkit and a link to
the wiki page with information about testing.
RoomsController #end method now redirecting with the :redir_url parameter refs #485
Correct tests for last revision
Return :unauthorized when the user can't create a room, refs #809

Was setting an error flash but returning 200.
Bump to version 1.3.0
Merge remote-tracking branch 'upstream/master'
Merge 1.3.0